Rename a table.

Parameters

$table: The table to be renamed.

$new_name: The new name for the table.

Throws

DatabaseSchemaObjectDoesNotExistException If the specified table doesn't exist.

DatabaseSchemaObjectExistsException If a table with the specified new name already exists.

Overrides DatabaseSchema::renameTable

File

includes/database/pgsql/schema.inc, line 479
Database schema code for PostgreSQL database servers.

Class

DatabaseSchema_pgsql

Code

function renameTable($table, $new_name) {
  if (!$this
    ->tableExists($table)) {
    throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot rename @table to @table_new: table @table doesn't exist.", array(
      '@table' => $table,
      '@table_new' => $new_name,
    )));
  }
  if ($this
    ->tableExists($new_name)) {
    throw new DatabaseSchemaObjectExistsException(t("Cannot rename @table to @table_new: table @table_new already exists.", array(
      '@table' => $table,
      '@table_new' => $new_name,
    )));
  }

  // Get the schema and tablename for the old table.
  $old_full_name = $this->connection
    ->prefixTables('{' . $table . '}');
  list($old_schema, $old_table_name) = strpos($old_full_name, '.') ? explode('.', $old_full_name) : array(
    'public',
    $old_full_name,
  );

  // Index names and constraint names are global in PostgreSQL, so we need to
  // rename them when renaming the table.
  $indexes = $this->connection
    ->query('SELECT indexname FROM pg_indexes WHERE schemaname = :schema AND tablename = :table', array(
    ':schema' => $old_schema,
    ':table' => $old_table_name,
  ));
  foreach ($indexes as $index) {

    // Get the index type by suffix, e.g. idx/key/pkey
    $index_type = substr($index->indexname, strrpos($index->indexname, '_') + 1);

    // If the index is already rewritten by ensureIdentifiersLength() to not
    // exceed the 63 chars limit of PostgreSQL, we need to take care of that.
    // Example (drupal_Gk7Su_T1jcBHVuvSPeP22_I3Ni4GrVEgTYlIYnBJkro_idx).
    if (strpos($index->indexname, 'drupal_') !== FALSE) {
      preg_match('/^drupal_(.*)_' . preg_quote($index_type) . '/', $index->indexname, $matches);
      $index_name = $matches[1];
    }
    else {
      if ($index_type == 'pkey') {

        // Primary keys do not have a specific name in D7.
        $index_name = '';
      }
      else {

        // Make sure to remove the suffix from index names, because
        // ensureIdentifiersLength() will add the suffix again and thus
        // would result in a wrong index name.
        preg_match('/^' . preg_quote($old_full_name) . '_(.*)_' . preg_quote($index_type) . '/', $index->indexname, $matches);
        $index_name = $matches[1];
      }
    }
    $this->connection
      ->query('ALTER INDEX ' . $index->indexname . ' RENAME TO ' . $this
      ->ensureIdentifiersLength($new_name, $index_name, $index_type));
  }

  // Now rename the table.
  // Ensure the new table name does not include schema syntax.
  $prefixInfo = $this
    ->getPrefixInfo($new_name);
  $this->connection
    ->query('ALTER TABLE {' . $table . '} RENAME TO ' . $prefixInfo['table']);
}